Genetic study was carried out among 76 isolates of Phytophthora citricola obtained from trees and shrubs belonging to 12 different plant genera grown in more than 10 nurseries. DNA was extracted from pure pathogen cultures and amplified by the PCR technique using ISSR and RAPD primers. The isolates clustered in two main groups. In one of them two subgroups were present. One of those subgroups contained isolates mostly from the family Ericaceae and the second mostly from coniferous plants. Close similarity between isolates from the same nursery was not a rule.
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